You don't need to panic, friend, if indeed you are currently holding Bitcoin, still maintaining because there is a time where Bitcoin will increase, so there is nothing to do. Now you just focus on other things, let Bitcoin do something according to its time which will increase by yourself.
Many people didn't expect this but there are a few of them that already saw this coming. They based their prediction on the year of 2018. There's a a thing that we can do for now, that is to buy and continue hodling. If we are worrying then leaving the market for a while can help us a lot. Btc doesn't only increase by itself but it needs the support of the public.